disable css sourcemap if minimizing or in production mode

Author: yyx990803

lib/loader.js

@@ -39,7 +39,12 @@ module.exports = function (content) {
   }
 
   // enable css source map if needed
-  if (this.sourceMap && options.cssSourceMap !== false) {
+  if (
+    this.sourceMap &&
+    !this.minimize &&
+    options.cssSourceMap !== false &&
+    process.env.NODE_ENV !== 'production'
+  ) {
     defaultLoaders.css = 'vue-style-loader!css-loader?sourceMap'
   }
 

lib/style-rewriter.js

@@ -69,7 +69,12 @@ module.exports = function (css, map) {
     to: file,
     map: false
   }
-  if (this.sourceMap && options.cssSourceMap !== false) {
+  if (
+    this.sourceMap &&
+    !this.minimize &&
+    options.cssSourceMap !== false &&
+    process.env.NODE_ENV !== 'production'
+  ) {
     opts.map = {
       inline: false,
       annotation: false,